66800013311 has 4 divisors (see below), whose sum is σ = 66801052872. Its totient is φ = 66798973752.

The previous prime is 66800013253. The next prime is 66800013317. The reversal of 66800013311 is 11331000866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66800013311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66800013317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416561 + ... + 554186.

It is an arithmetic number, because the mean of its divisors is an integer number (16700263218).

Almost surely, 2^66800013311 is an apocalyptic number.

66800013311 is a deficient number, since it is larger than the sum of its proper divisors (1039561).

66800013311 is an equidigital number, since it uses as much as digits as its factorization.

66800013311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039560.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 66800013311 in words is "sixty-six billion, eight hundred million, thirteen thousand, three hundred eleven".